By default, Azure AD configures a certificate to expire after three years when it is created automatically during SAML single sign-on configuration. Because you can't change the date of a certificate after you save it, you need to create a new certificate. For steps on how to do so, please refer [Customize the expiration date for your federation certificate and roll it over to a new certificate](manage-certificates-for-federated-single-sign-on.md#customize-the-expiration-date-for-your-federation-certificate-and-roll-it-over-to-a-new-certificate).
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